Recovery of caprolactam from nylon-6 scrap

Details Recovery of caprolactam from nylon-6 scrap Recovery of caprolactam from nylon-6 scrap

C - Chemistry, Metallurgy

07

D

C07D 223/10 (2006.01) C07C 29/09 (2006.01) C07C 31/20 (2006.01) C07C 51/09 (2006.01) C07C 63/26 (2006.01) C07C 209/86 (2006.01) C07C 211/12 (2006.01) C07D 201/12 (2006.01) C08J 11/14 (2006.01)

Patent

CA 2229207

A process for recovering monomer from multi-component waste material that includes a hydrolyzable polymer, includes contacting the multi-component waste material with water and subjecting the resulting mixture to heat and pressure to form a liquid aqueous portion and a water insoluble portion. The liquid aqueous portion mainly includes depolymerization products of the hydrolyzable polymer, and the water insoluble portion mainly includes components other than the depolymerization products. This mixture is cooled and the liquid aqueous portion and the water insoluble portion are separated. Monomer that formed the hydrolyzable polymer is recovered from the liquid aqueous solution.

Ce procédé de récupération d'un monomère à partir de matériaux de rebut contenant plusieurs constituants, consiste à utiliser un polymère hydrolysable, à mettre en contact les matériaux de rebut avec de l'eau, puis à soumettre le mélange résultant à la chaleur et à une pression afin de former une portion liquide aqueuse ainsi qu'une portion insoluble dans l'eau. La portion liquide aqueuse comprend principalement des produits de dépolymérisation du polymère hydrolysable, et la portion insoluble dans l'eau comprend principalement des constituants autres que ces produits de dépolymérisation. On refroidit ensuite le mélange puis on sépare la portion insoluble dans l'eau de la portion liquide aqueuse et on récupère, à partir de cette dernière, le monomère formant le polymère hydrolysable.

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